Biocidal applications trends of bio-oils from pyrolysis: Characterization of several conditions and biomass, a review

Recovery of antifungal compounds from wood and coffee industry side-streams and residues for wood preservative formulations

“…This supports our results suggesting that propionic acid and organic acids might play an important role in the fungal inhibition of pyrolysis distillates. These findings also agree with Mattos et al (2019), who highlighted that the antifungal activity of the pyrolysis distillates might not be due only to the phenolics but also to other constituents.…”

“…Phenolic compounds, present in all the potential bio-based preservatives tested, are often considered to inhibit wood-decaying fungi (Harju et al 2003, Anouhe et al 2018). In the case of pyrolysis distillates, their antimicrobial and insecticidal properties are related to the presence of organic acids, phenolic compounds and fatty acids, but a chemical analysis of the distillates is often not performed in the investigations (Mattos et al 2019).…”

“…Several studies have found the antifungal properties of pyrolysis distillates to be caused by the organic acids present. Recently, Mattos et al (2019) reviewed the use of pyrolysis distillates as antimicrobials and insecticides, and highlighted the role of phenolics and organic acids, especially acetic acid. Organic acids are used as antimicrobials in food, and this activity is based on two mechanisms, cytoplasmic acidification and accumulation of the dissociated acid anion to levels that are toxic to microbes (Taylor et al 2012in Mani-López et al 2012, which could also be the mechanisms that affect the wood-decaying fungi.…”

A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks

“…[51] As a levoglucosan with content of 5.19%–14.33% in bio-oils, it has received extensive attention in pharmaceutical manufacturing, surfactants, and is likely to be applied in the fields of archaeology and environmental science [51,52]. It is worth noting that recent literature has shown that carbonyl compounds and acetic acid in bio-oils have antibacterial and insecticidal properties, respectively, which provide a good source of bio-oil refining into natural insecticides and antibacterial agents [53]. Once the fatty acids separated in bio-oils can be made into natural pesticides, the problem in the past of using pesticides to pollute the environment may be solved.…”

Antifungal Activity of Organic Acies and Their Impact on Wood Decay Resistance

“…The study performed by Oramahi et al (2018), additionally, found that the only pyrolysis vinegar performed well as antifungal agent contained propionic acid and had the highest acetic acid concentration of the ones tested. Other research groups have found that phenolics are responsible for the antifungal activity of both pyrolysis distillates and wood vinegars (Mourant et al 2005;Baimark and Niamsa 2009), whereas Mattos et al (2019) highlighted that the antimicrobial activity of pyrolysis distillates is related to the presence of organic acids-acetic acid specifically-phenolic derivatives and carbonyl compounds and their synergies, although chemical analyses of distillates are often not performed. Thus, there is not enough knowledge of the role played by acids and their synergies in wood preservation, as the impact that acids have on wood decay is often not isolated from the other constituents of bio-based chemicals.…”